Add protected admin scope with login

RazorPagesMovie/Models/AdminUser.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace RazorPagesMovie.Models;
+
+public class AdminUser
+{
+    public int Id { get; set; }
+
+    [Required]
+    [StringLength(100)]
+    public string Username { get; set; } = string.Empty;
+
+    [Required]
+    public string PasswordHash { get; set; } = string.Empty;
+}